Indicates that an attempt to notify required participants of a transaction
involving one or more regions that are configured with MembershipAttributes may have failed. The commit itself was completed but
one or more regions affected by the transaction have one or more required
roles that were not successfully notified. Failure may be caused by
departure of one or more required roles while sending the operation to
them. This exception will contain one RegionDistributionException
for every region that had a reliability failure. Details of the failed
required roles are provided
in each RegionDistributionException.